JBO Thread Ring Gauge (GO) for Metric Coarse threads is a precision inspection tool designed to verify external M3 x 0.5 threads on fasteners and mating components. This GO gauge supports quick go/no-go checks, helping ensure parts fit correctly and meet the coarse-thread standard.

Built for reliability in busy workshops, it is ideal for engineers, machinists, inspectors, and quality teams who demand consistent thread measurements.

• Go/No-Go quick verification: Delivers fast pass/fail checks for M3 x 0.5 metric coarse threads, helping you speed up inspections and reduce bottlenecks on the line.
• Durable hardened steel construction: Built to withstand daily shop use, resisting wear and maintaining dimension accuracy across thousands of checks.
• Designed for metric coarse right-hand threads: Specifically machined for M3 x 0.5 coarse right-hand threads, ensuring reliable mating and repeatable measurements across operators and days.

In practice, this gauge helps streamline quality control by providing a clear, objective check of thread size. With its precise geometry and durable materials, you can trust that your components fit as intended, reducing trials, rework, and returns. Whether in a production line, workshop, or inspection lab, the JBO GO gauge delivers consistent results that support tighter tolerances and higher overall performance of your threaded assemblies.